Enabled type checking as described by PEP-561

Author: michaelosthege

mcbackend/py.typed

@@ -38,6 +38,7 @@ def get_version():
         "License :: OSI Approved :: GNU Affero General Public License v3",
         "Intended Audience :: Science/Research",
     ],
+    package_data={"mcbackend": ["py.typed"]},
     install_requires=[open(pathlib.Path(ROOT, "requirements.txt")).readlines()],
     python_requires=">=3.7",
 )